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A dedicated mains spur will improve the quality of your hi-fi system as the power is drawn directly from the supply which is not sharing with the microwave, cooker, shower, fridge and all the other house-hold appliances which can pollute the mains supply considerably. The Mains Cables R Us mains spur cable is safe to use underneath floorboards and behind plasterboard. It is made from oxygen free copper shielded with an active earth loop system. 6mm sq cable for all conductors.
All work involving mains wiring should be conducted by a qualified electrician, if in doubt seek out a professional.